| 摘要 |
A wind turbine blade (1) is disclosed having oscillation damping means provided in the blade (1) for damping oscillations of the blade (1), in particular edgewise oscillations of the blade (1) in the rotational plane of a rotor on which the blade (1) is mounted. The damping means comprises a U- shaped cavity (2) in which a saturated solution of sodium chloride in water may oscillate in counter-phase with the oscillations of the blade (1). The upper end of the arms (5, 6) of the U-shaped cavity (2) are connected with a passage way (7) so that an O-shaped cavity (2) is provided. The cavity (2) m ay be tuned to dampen oscillations of the first natural edgewise frequency or t he second natural edgewise frequency of the blade (1) or the damping means may comprise both types of dampers (2). |
